We bought one of these recently for $200. A guy on EBAY sells them. He seems to be the only one is the US selling them. Don't waste your money. There is no support or spares for this line. Google "Jiang Dong JD-165" and see for yourself.
If you search for it, you'll be dismayed when you read the report a guy wrote on his experince with a JD-165 engine, the same model we bought. It blew up after less than 100 hours.
We disassembled ours after 10 hours running and it was nearly dead with main bearing (CSC bearings) failure (micro-welding), the worst cylinder honing I've ever seen, bad cam lobes etc. This is a classic case where the Chinese did a real shitty minimalist job of copying a proven engine and then selling it as look-alike clone.
Using the internet to share these experiences acts as the "great equalizer" by exposing this type of "consumer fraud". Either Jiang Dong will to clean up their act or vanish from the business world.
RB